Move `MutableStateFlow.updateCopy` to arrow.optics

The extension function

```kotlin
public fun MutableStateFlow.updateCopy(block: Copy.() -> Unit)
```

is useful outside of Android's compose library. I suggest to move it from `arrow-optics-compose` to the `arrow-optics` library for those who do not use compose.

Start by locating MutableStateFlow.updateCopy in the arrow-optics-compose module and inspect the arrow-optics module's build configuration and tests. Move the extension into arrow-optics so it is available without the Compose library, then verify the existing behavior and module dependencies remain correct.

Written by the indexing model from the issue text.